Study on structure of the worldScientists have tried to find the methods that will be used to study the structure of the world, both directly and indirectly by trying to use evidence that is capable of discovery, including the main branch of the scientific theory and modern technology in order to answer these questions.When 300 years ago, Sir Isaac Newton had discovered how to calculate the average density of the Earth. There is 2 times the density of rocks on the surface of the Earth. Shows that within the world must contain substances that have a density greater than on the surface of the Earth.Next to it another 100 years of diverse research disciplines to scientists and explore to find knowledge about the structure of the world, from things that burst out of a volcano, which is evidence that indicates that inside the world of heat and pressure that is melting rock. The period till now. There is an internal thermometer deep mining and drilling holes: Figure 1.1, which showed that the world's temperature rise according to the depths from the surface of the Earth because there is not yet any technology in the current down to collect samples and environmental measurement under the Earth in great depth. However, humans are also trying to find information about the structure of the world, directly from multiple methods. Such studies from drilling survey. Study on series of Ophiolite rocks (rock group in the past of the crust beneath the ocean, but now found on land) Study on volcanic rocks Study on the chemical components of the fishing bat taka-on Earth and rock samples from the Moon, etc.It is also used to study the structure of the world indirectly participate with, which is the study of properties within the world based on scientific principles, such as the study of seismic waves caused by the earthquake. Man-made waves (nuclear blast trials) and measuring gravity at the surface of the Earth, etc. The students thought that the seismic waves properties use geologists to study the internal structure of the world?
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